Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; TISPAN; NGN Signalling Control Protocol; Communication HOLD (HOLD) PSTN/ISDN simulation services; Protocol specification (V8.1.0; 3GPP TS 24.410
The present document specifies the@ stage three@ Protocol Description of the Communication Hold (HOLD) services@ based on stages one and two of the ISDN Hold (HOLD) supplementary services. Within the Next Generation Network (NGN) the stage 3 description is specified using the IP Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP).